基于热-应力耦合的LNG储罐泄漏状态下外罐壁受力分析  

Force Analysis on External Tank Wall of LNG Tank under Leakage Based on Ther-mal-stress Coupling

作　　者：张天鹤 高辉 Zhang Tianhe;Gao Hui(China Tianchen Engineering Corporation,Tianjin 300400,China)

机构地区：[1]中国天辰工程有限公司,天津300400

出　　处：《特种结构》2024年第3期1-7,共7页Special Structures

摘　　要：为分析LNG全容罐在内罐泄漏状态下的外罐壁液密性,采用大型通用有限元分析软件对外罐在正常使用、夏季高中低液位及局部冷点泄漏状态下的结构响应进行了非线性有限元分析,并验证分析了热角保护结构的可靠性。研究结果表明:正常使用阶段外罐壁向内轻微收缩,外罐壁外侧根部出现轻微受拉损伤。泄漏阶段外罐壁收缩明显增大,外罐壁内侧出现大范围受拉损伤,钢筋应力水平显著增加,但外罐壁液密性指标满足要求。热角保护结构在内罐泄漏状态下可有效保证外罐壁底部不直接接触低温液体。To analyze the liquid tightness of external tank wall of LNG full containment storage tank under leakage from internal tank,nonlinear finite element studies on the structural response of external tank under op-eration,high,medium,low liquid levels and local leakage conditions in summer,were carried out.Besides,the reliability of thermal corner projection was verified and analyzed.The results indicate that,the external tank wall slightly contracts inward during operation,and mild tensile damage occurs on the outer root.The contrac-tion of the wall significantly increased under leakage,and extensive tensile damage occurs on the inner side,while the stress of the rebar extremely rises,but the liquid tightness meets the requirements.The thermal corner projection can effectively ensure that cryogenic liquid shall not reach out to the bottom concrete of external wall directly when leaking from the internal tank.

关 键 词：LNG储罐 泄漏 液密性 热-应力耦合 有限元分析 

分 类 号：TE88[石油与天然气工程—油气储运工程] TU998.9[建筑科学—市政工程]